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Channel scanning tool for DVB and ATSC channels

w_scan scans for DVB-S/S2, DVB-T, DVB-C and ATSC channels and creates a
channels.conf, that can be used directly by the Linux Video Disc Recorder VDR.
It is also possible to output channels in a format readable by the
czap/tzap tools provided by linuxtv-dvb-zap, xine, totem, kaffeine or me-tv.

Unlike the scan utility in linuxtv-dvb-apps, there is no need to specify
an initial transponder and w_scan automatically detects the DVB or ATSC
card to be used.